Output & Runtime:*Max output of 2800 lumens for approximately 1 Hour*Mid output of 1200 lumens for approximately 2.5 Hours*Min output of 280 lumens for approximately 10 HoursNote:Stated brightness and runtime figures are based on tests using 3PCS 18650 Li-ion batteries(approximate 2200mAH) under laboratory conditions. Variances in these figures will occur depending on batteries used and individual usage habits.